In recent years, it has been determined that investors are influenced by psychological factors while making investment decisions. Confidence indices are used to learn investors’ expectations about the economy. In this paper, it is investigated whether there is short and long-run relationship between Borsa Istanbul sector indices and real sector confidence index. The short and long-run relationships between the stock indices and the real sector confidence index, which are determined to be stationary at different levels, are tested by ARDL Bound Test. The findings show that there is a relationship between the real sector confidence index and all sector indices both in the long-run and in the short-run. In addition, it is determined that the increase in real sector confidence index affects positively stock returns (except XULAS and XTAST) in the short-run. The results of causality showed that mostly there is a causality relationship from sector indices to real sector confidence index. Thus, it has been shown that psychological factors should be considered as determinants of changes in the stock market.